Practice Test: Mechanical Engineering (ME)- 7 - Mechanical Engineering MCQ

A bird files along the three sides of a field in the shape of an equilateral triangle at speeds of 3, 6, 8 km/hr respectively. The average speed of the bird is

Choose the most appropriate words from the options given below to fill in the blanks.

She was ______ to travel abroad and _____ in the field of commerce as per her wishes.

In a 1600 m race around a circular track of length 400 m, the faster runner and the slowest runner meet at the end of the sixth minute, for the first time after the start of the race. All the runners maintain uniform speed throughout the race. If the faster runner runs at twice the speed of the slowest runner. Find the time taken by the faster runner to finish the race

Select the pair that best expresses a relationship similar to that expressed in the pair:

Horse: Foal

Juvenile delinquency is also termed as Teenage Crime. Basically, juvenile delinquency refers to the crimes committed by minors. These crimes are committed by teenagers without any prior knowledge of how it affects the society. These kind of crimes are committed when children do not know much about outside world.

Which of the following Inferences is correct with respect to above passage?

If n and y are positive integers and 450 y = n³, which of the following must be an integer? 

The graph shows cumulative frequency % of research scholars and the number of papers published by them. Which of the following statements is true?

For which value of x, the following matrix A is a singular matrix.

Find the laplace transform of t²sin (2t).

Consider the following function:

The integrating factor of equation y log y dx + (x – log y) dy = 0 is

The Mohr’s circle given below corresponds to which one of the following stress condition.

For a laminar flow over a flat plate, the local heat transfer coefficient ‘h_x’ varies as x^-1/2, where x is the distance from the leading edge (x = 0) of the plate. The ratio of the average coefficient ‘h_a’ between the leading edge and some location ‘A’ at x = x on the plate to the local heat transfer coefficient ‘h_x’ at A is:

A vapour absorption refrigeration system is a heat pump with three thermal reservoirs as shown in the figure. A refrigeration effect of 100 W is required at 250 K when the heat source available is at 400 K. Heat rejection occurs at 300 K. The minimum value of heat required (in W) is

The heat loss from a fin is 8 W. The effectiveness and efficiency of the fin are 4 and 0.8, respectively. The heat loss (in W) from the fin, keeping the entire fin surface at base temperature, is ________.

An activity has an early start date of the 10^th and a late start date of the 19^th. The activity has a duration of four days. There are no non-workdays. From the information given, what can be concluded about the activity?

In Fig. 1-12, assume that a 20-mm-diameter rivet joins the plates that are each 110 mm wide. The allowable stresses are 120 MPa for bearing in the plate material and 60 MPa for shearing of rivet. Determine (a) the minimum thickness of each plate; and (b) the largest average tensile stress in the plates.

The coeffcient of thermal expansion of steel is 12 × 10^-6/°C and that of stainless steel is 18 × 10^-6/°C. Length of steel bar is twice the length of stainless steel bar. The ratio of expansion of steel bar to expansion of stainless steel bar, when there is rise of temperature is-

At room temperature, pure titanium possesses which of the following crystal structure _______?

A 400 mm long sprue carries molten metal to fill a cylindrical mould of diameter 20 mm & height of 30 mm by top gating system. If the molten metal flow rate through the sprue is 600 mm³/sec, & it is maintained constant by maintaining constant metal head in pouring basin. Then find the mould filling time (in Seconds) ________?

A cup is drawn in a deep drawing operation. The inside diameter of cup is 100 mm. If sheet thickness and blank diameter is 4 mm and 240 mm respectively then find percentage reduction ________?

A turbine develops 900 kW when running at 200 r.p.m. The head on the turbine is 30 m. If the head on the turbine is reduced to 18 m, determine the speed of the turbine (in rpm).

The frequency of a spring-mass suspension becomes 60 percent of the resonant frequency when a damper is added to it. What will be the damping ratio?

Square blanks of 8 mm side lengths are blanked from an aluminium sheet of 3 mm thickness. The shear strength of the aluminium is 85 MPa. The minimum blanking force (in kN) is _________?

A cold rolled steel shaft is designed on the basis of maximum shear stress theory. The principal stresses induced at its critical section are 60 MPa and -60 MPa respectively. If the yield stress for the shaft material is 360 MPa, the factor of safety of the design is:

Which of following related fluid flow parameters exist both in rotational and irrotational flows?